CN115469489A

CN115469489A - Display device

Info

Publication number: CN115469489A
Application number: CN202210656342.3A
Authority: CN
Inventors: 兵头洋祐; �冈真一郎; 大平启史
Original assignee: Japan Display Inc
Current assignee: Japan Display Inc
Priority date: 2021-06-10
Filing date: 2022-06-10
Publication date: 2022-12-13
Also published as: DE102022205274A1; US11874570B2; JP2022188910A; US20230221603A1; US11630356B2; US20220397783A1

Abstract

The invention provides a display device with 2 display panels. A display device according to one embodiment includes a first display panel, a second display panel, and an adhesive layer that adheres the first display panel and the second display panel. The first display panel includes: a first scan line extending in a first direction; a first signal line bent in a first bending direction and extending in a second direction; and a first pixel electrically connected to the first scan line and the first signal line, the first pixel including a first pixel electrode having a plurality of first line portions extending in parallel with the first signal line. The second display panel includes: a second scanning line extending in the first direction; a second signal line bent in a second bending direction and extending in the second direction; and a second pixel electrically connected to the second scanning line and the second signal line, the second pixel including a second pixel electrode having a plurality of second line portions intersecting the second signal line in a plan view.

Description

Display device

This application is based on Japanese patent application No. 2021-097194 (application date: 6/10/2021), from which it enjoys a preferential benefit. This application is incorporated by reference in its entirety.

Technical Field

Embodiments of the present invention relate to a display device.

Background

In recent years, in order to improve the contrast of a display device, a technique of using a display panel for light adjustment in addition to a display panel for image display has been developed, and further improvement in display quality of a display device configured using this technique has been desired.

Disclosure of Invention

An object of the present disclosure is to improve display quality of a display device including two display panels.

According to one embodiment, the present invention comprises: a first display panel having a display area for displaying an image; a second display panel having a dimming region for controlling brightness of the display region; and an adhesive layer that adheres the first display panel and the second display panel, wherein the first display panel includes: a first scan line extending in a first direction; a first signal line which is bent in a first bending direction and extends in a second direction intersecting the first direction; and a first pixel electrically connected to the first scan line and the first signal line, the first pixel including a first pixel electrode having a plurality of first line portions extending in parallel with the first signal line, the second display panel including: a second scan line extending along the first direction; a second signal line which is bent in a second bending direction and extends in the second direction; and a second pixel electrically connected to the second scanning line and the second signal line, the second pixel including a second pixel electrode having a plurality of second line portions intersecting the second signal line in a plan view.

Drawings

Fig. 1 is an exploded perspective view showing a configuration example of a display device including 2 display panels.

Fig. 2 is a sectional view schematically showing the structure of the display device shown in fig. 1.

Fig. 3 is a cross-sectional view showing a cross-section of the display device shown in fig. 2 in more detail.

Fig. 4 is a plan view showing in detail a pixel arranged on a liquid crystal display panel according to an embodiment.

Fig. 5 is a plan view showing in detail the pixels arranged on the light control panel of the present embodiment.

Fig. 6 is a plan view showing a part of two adjacent pixel electrodes arranged on the liquid crystal display panel and a part of two adjacent pixel electrodes arranged on the light control panel in this embodiment.

Fig. 7 is a plan view showing the shape of a light shielding film disposed on the light control panel of the present embodiment.

Fig. 8 is a plan view showing another shape of the light shielding film disposed on the light control panel according to the embodiment.

Fig. 9 is a plan view showing still another shape of the light shielding film disposed on the light control panel of the present embodiment.

Fig. 10 is a plan view showing a pixel arranged on the light control panel of the comparative example.

Fig. 11 is another plan view showing in detail the pixels arranged on the light control panel of the present embodiment.

Detailed Description

Several embodiments are described with reference to the drawings.

The disclosure is merely an example, and it is needless to say that the contents that can be easily conceived by those skilled in the art with respect to appropriate modifications for keeping the gist of the invention are included in the scope of the invention. In order to clarify the description, the drawings may schematically show the width, thickness, shape, and the like of each part as compared with the actual embodiment, but the drawings are merely examples and do not limit the explanation of the present invention. In the present specification and the drawings, the same reference numerals are given to components that perform the same or similar functions as or to the components described above with respect to the already-shown drawings, and overlapping detailed descriptions may be omitted as appropriate.

Fig. 1 is an exploded perspective view schematically showing the configuration of a display device DSP provided with two display panels. Fig. 1 shows a three-dimensional space defined by a first direction X, a second direction Y perpendicular to the first direction X, and a third direction Z perpendicular to the first direction X and the second direction Y. The first direction X and the second direction Y are orthogonal to each other, but may intersect at an angle other than 90 degrees. In the present embodiment, the third direction Z is defined as an upper direction, and a direction opposite to the third direction Z is defined as a lower direction. When the "second member above the first member" and the "second member below the first member" are used, the second member may be in contact with the first member or may be located at a position away from the first member. Further, an observation position for observing the display device DSP is provided on the tip side of an arrow indicating the third direction Z, and observation from the observation position to an X-Y plane defined by the first direction X and the second direction Y is referred to as "top view".

As shown in fig. 1, the display device DSP includes a liquid crystal display panel PNL1 (first display panel), a dimming panel PNL2 (second display panel), and a backlight unit BL. As shown in fig. 1, by disposing the dimming panel PNL2 between the liquid crystal display panel PNL1 and the backlight unit BL, the contrast of an image displayed on the liquid crystal display panel PNL1 can be improved.

The liquid crystal display panel PNL1 has a rectangular shape in one example. In the illustrated example, the short side EX of the liquid crystal display panel PNL1 is parallel to the first direction X, and the long side EY of the liquid crystal display panel PNL1 is parallel to the second direction Y. The third direction Z corresponds to the thickness direction of the liquid crystal display panel PNL 1. The main surface of the liquid crystal display panel PNL1 is parallel to an X-Y plane defined by the first direction X and the second direction Y. The liquid crystal display panel PNL1 has a display area DA and a peripheral area SA located outside the display area DA. The peripheral area SA has a terminal area MT to which a driver IC and a flexible printed circuit board are mounted. In fig. 1, the terminal area MT is indicated by oblique lines.

The display area DA is an area for displaying an image, and includes a plurality of pixels PX arranged in a matrix, for example. As shown in an enlarged view in fig. 1, each pixel PX is electrically connected to a scanning line GL and a signal line SL, and includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, and the like.

The switching element SW is formed of, for example, a Thin Film Transistor (TFT), and is electrically connected to the scanning line GL and the signal line SL. The scanning line GL is electrically connected to the switching element SW in each of the pixels PX arranged in the first direction X. The signal line SL is electrically connected to the switching element SW in each of the pixels PX arranged in the second direction Y. The pixel electrode PE is connected to the switching element SW. Each pixel electrode PE faces the common electrode CE, and the liquid crystal layer LC is driven by an electric field generated between the pixel electrode PE and the common electrode CE. The capacitor CS is formed, for example, between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE.

The terminal area MT extends along the short side EX of the liquid crystal display panel PNL 1. A terminal portion is formed in the terminal area MT, and the liquid crystal display panel PNL1 is electrically connected to an external device such as a flexible printed circuit board, for example, via the terminal portion.

Although detailed structures are not shown in fig. 1, the dimming panel PNL2 has substantially the same structure as the liquid crystal display panel PNL 1. The configuration of a part of the liquid crystal display panel PNL1 and the light control panel PNL2 which are different from each other will be described later together with the description of fig. 2 and 3.

The backlight unit BL is disposed below the dimming panel PNL2, and displays an image by controlling light from the backlight unit BL for each pixel PX.

Fig. 2 is a sectional view schematically showing the structure of the display device DSP shown in fig. 1.

As described above together with the description of fig. 1, the display device DSP includes the liquid crystal display panel PNL1, the light control panel PNL2, and the backlight unit BL. In fig. 2, the backlight unit BL is not illustrated. The liquid crystal display panel PNL1 and the light control panel PNL2 are bonded by, for example, a transparent adhesive layer OCA. The liquid crystal display panel PNL1 and the light control panel PNL2 are arranged in a common configuration so as to overlap in a plan view, and are bonded by the adhesive layer OCA.

First, the structure of the liquid crystal display panel PNL1 will be described below.

As shown in fig. 2, the liquid crystal display panel PNL1 includes a first substrate SUB11, a second substrate SUB21, a liquid crystal layer LC1, a first polarizing plate PL11, and a second polarizing plate PL21.

The liquid crystal layer LC1 is sandwiched between the first substrate SUB11 and the second substrate SUB21, and is sealed by a seal member SE 1. The first polarizing plate PL11 is disposed below the first substrate SUB11, and the second polarizing plate PL21 is disposed above the second substrate SUB 21. The polarization axis of the first polarizing plate PL11 and the polarization axis of the second polarizing plate PL21 have, for example, a crossed nicols relationship, i.e., 90 degrees.

The driver IC1 and the flexible printed circuit board FPC1 are mounted on the terminal area MT1 of the liquid crystal display panel PNL 1. The driver IC1 and the flexible printed circuit board FPC1 mounted on the terminal area MT1 are covered with a protective film PF 1.

Next, the structure of the light-adjusting panel PNL2 will be described.

As shown in fig. 2, the light control panel PNL2 includes a first substrate SUB12, a second substrate SUB22, a liquid crystal layer LC2, a first polarizing plate PL12, and a second polarizing plate PL22, similarly to the liquid crystal display panel PNL 1.

The liquid crystal layer LC2 is sandwiched between the first substrate SUB12 and the second substrate SUB22, and is sealed by a seal member SE 2. The first polarizing plate PL12 is disposed below the first substrate SUB12, and the second polarizing plate PL22 is disposed above the second substrate SUB 22. The polarization axis of the first polarizing plate PL12 and the polarization axis of the second polarizing plate PL22 are in a cross nicol relationship, i.e., 90 degrees, for example. In addition, the polarization axis of the first polarizing plate PL11 of the liquid crystal display panel PNL1 and the polarization axis of the second polarizing plate PL22 of the light control panel PNL2 are in the same direction.

The driver IC2 and the flexible printed circuit board FPC2 are mounted on the terminal area MT2 of the light control panel PNL 2. The driver IC2 and the flexible printed circuit board FPC2 mounted on the terminal area MT2 are covered with a protective film PF 2.

Here, the structure of the display device DSP will be described in more detail with reference to the cross-sectional view of fig. 3.

First, the structure of the liquid crystal display panel PNL1 will be described in detail below.

As described above together with the description of fig. 2, the liquid crystal display panel PNL1 includes the first substrate SUB11, the second substrate SUB21, the liquid crystal layer LC1, the first polarizing plate PL11, and the second polarizing plate PL21.

As shown in fig. 3, the first substrate SUB11 includes a first transparent substrate 11 and an alignment film AL11. In addition to the above configuration, the first substrate SUB11 includes, for example, the scanning line GL (to be described later, the scanning line GL 1), the signal line SL (to be described later, the signal line SL 1), the switching element SW, the pixel electrode PE (to be described later, the pixel electrode PE 1), the common electrode CE, and the like shown in fig. 1, but these are not shown in fig. 3.

The first transparent substrate 11 has a main surface (lower surface) 11A and a main surface (upper surface) 11B opposite to the main surface 11A. On the principal surface 11B side of the first transparent substrate 11, scanning lines GL, signal lines SL, switching elements SW, pixel electrodes PE, common electrodes CE, and the like are provided. An alignment film AL11 in contact with the liquid crystal layer LC1 is also provided on the principal surface 11B side of the first transparent substrate 11. A first polarizing plate PL11 is bonded to the main surface 11A of the first transparent substrate 11.

As shown in fig. 3, the second substrate SUB21 includes a second transparent substrate 21, a light-shielding film BM1, a color filter CF, a protective film OC, and an alignment film AL21. In addition, the light shielding film BM1 may also be referred to as a light shielding pattern.

The second transparent substrate 21 has a main surface (lower surface) 21A and a main surface (upper surface) 21B opposite to the main surface 21A. The main surface 21A of the second transparent substrate 21 faces the main surface 11B of the first transparent substrate 11. The light-shielding film BM1 is provided on the main surface 21A side of the second transparent substrate 21, and divides each pixel PX (more specifically, a pixel PX1 described later) in the same manner as the scanning line GL and the signal line SL. A part of the color filter CF overlaps the light shielding film BM 1. The color filter CF includes a red color filter CFR, a green color filter CFG, a blue color filter CFB, and the like. The protective film OC covers the color filter CF. The protective film OC can prevent the pigments constituting the color filter CF from bleeding out to the liquid crystal layer LC 1. The alignment film AL21 covers the protective film OC and is in contact with the liquid crystal layer LC 1. A second polarizing plate PL21 is bonded to the principal surface 21B side of the second transparent substrate 21.

The first transparent substrate 11 and the second transparent substrate 21 are insulating substrates such as glass substrates and plastic substrates. The light-shielding film BM1 is preferably made of a black resin in which a black pigment or the like is dispersed. The alignment films AL11 and AL21 are horizontal alignment films having an alignment regulating force substantially parallel to the X-Y plane. The alignment regulating force may be imparted by rubbing treatment or by photo-alignment treatment.

Next, the structure of the light-adjusting panel PNL2 will be described in detail.

As described above together with the description of fig. 2, the light control panel PNL2 includes the first substrate SUB12, the second substrate SUB22, the liquid crystal layer LC2, the first polarizing plate PL12, and the second polarizing plate PL22.

As shown in fig. 3, the first substrate SUB12 includes a first transparent substrate 12 and an alignment film AL12. In addition to the above configuration, the first substrate SUB12 includes, similarly to the liquid crystal display panel PNL1, a scanning line GL (to be described later in detail), a signal line SL (to be described later in detail, the signal line SL 2), a switching element SW, a pixel electrode PE (to be described later in detail, the pixel electrode PE 2), a common electrode CE, and the like, but illustration of these is omitted in fig. 3.

The first transparent substrate 12 has a main surface (lower surface) 12A and a main surface (upper surface) 12B opposite to the main surface 12A. On the principal surface 12B side of the first transparent substrate 12, scanning lines GL, signal lines SL, switching elements SW, pixel electrodes PE, common electrodes CE, and the like are provided. An alignment film AL12 in contact with the liquid crystal layer LC2 is further provided on the principal surface 12B side of the first transparent substrate 12. A first polarizing plate PL12 is bonded to the main surface 12A side of the first transparent substrate 12.

As shown in fig. 3, the second substrate SUB22 includes a second transparent substrate 22, a light-shielding film BM2, and an alignment film AL22. The light shielding film BM2 may be referred to as a light shielding pattern as in the light shielding film BM 1.

Unlike the liquid crystal display panel PNL1, the light control panel PNL2 does not include the color filter CF on the second substrate SUB22 of the light control panel PNL2 in order to control brightness and to prevent color image formation. The light control panel PNL2 is different from the liquid crystal display panel PNL1 in that the protective film OC is not provided. This is because, as described above, with the color filter CF not provided, it is not necessary to suppress the bleeding of the pigment (resin) into the liquid crystal layer LC 2.

The second transparent substrate 22 has a main surface (lower surface) 22A and a main surface (upper surface) 22B opposite to the main surface 22A. The main surface 22A of the second transparent substrate 22 faces the main surface 12B of the first transparent substrate 12. The light-shielding film BM2 is provided on the principal surface 22A side of the second transparent substrate 22. The alignment film AL22 covers the light shielding film BM2 and contacts the liquid crystal layer LC 2. The second polarizing plate PL22 is bonded to the principal surface 22B side of the second transparent substrate 22.

In fig. 3, the light shielding film BM2 is illustrated as being provided on the second transparent substrate 22 side, but the light shielding film BM2 may be provided on the first transparent substrate 12 side. The light-shielding film BM2 may be made of an opaque metal material such as molybdenum (Mo), aluminum (Al), tungsten (W), titanium (Ti), or silver (Ag) unlike the light-shielding film BM1 of the liquid crystal display panel PNL1, or may be made of a black resin in which a black pigment is dispersed, similarly to the light-shielding film BM 1. In addition, when the light shielding film BM2 is formed of an opaque metal material, the light shielding film BM2 may be connected to the common electrode CE. This can suppress the resistance value of the common electrode CE made of ITO or the like to be low.

The first transparent substrate 12 and the second transparent substrate 22 are insulating substrates such as glass substrates and plastic substrates. The alignment films AL12 and AL22 are horizontal alignment films having an alignment regulating force substantially parallel to the X-Y plane. The alignment regulating force may be imparted by rubbing treatment or by photo-alignment treatment.

The liquid crystal display panel PNL1 and the light control panel PNL2 are bonded by, for example, a transparent adhesive layer OCA. The liquid crystal display panel PNL1 and the light control panel PNL2 are arranged in a common configuration so as to overlap in a plan view, and are bonded by the adhesive layer OCA.

The backlight unit BL is disposed below the dimming panel PNL 2. As the backlight unit BL, various types of backlight units can be used, for example, a backlight unit using a Light Emitting Diode (LED) as a light source, a backlight unit using a Cold Cathode Fluorescent Lamp (CCFL) as a light source, or the like can be used. Although not shown in fig. 3, a cover member or the like may be further disposed on the second polarizing plate PL21 of the liquid crystal display panel PNL 1.

Fig. 4 is a plan view showing in detail the pixels PX1 arranged in the display region DA of the liquid crystal display panel PNL 1. In addition, fig. 4 shows one of the plurality of pixels PX1 arranged in the display region DA of the liquid crystal display panel PNL 1.

In the display region DA of the liquid crystal display panel PNL1, a plurality of pixels PX1 are arranged in a matrix. As shown in fig. 4, the pixel PX1 includes sub-pixels PXR, PXG, and PXB of red (R), green (G), and blue (B). The scanning line GL1 (first scanning line) is arranged between the pixels PX1 arranged in the second direction Y. The signal line SL1 (first signal line) is arranged between the subpixels PXR, PXG, and PXB arranged along the first direction X. The scanning lines GL1 extend in the first direction X and are arranged at intervals in the second direction Y. The signal lines SL1 extend in the second direction Y while being bent in directions d1 and d2 intersecting the second direction Y, and are arranged at intervals in the first direction X. In the present embodiment, the angle formed by the second direction Y and the directions d1 and d2 is defined as θ 1. The direction having the angle θ 1 with the second direction Y may be referred to as a first bending direction.

The sub-pixels PXR, PXG, and PXB included in the pixel PX1 have the pixel electrode PE1 (first pixel electrode) having the same shape, respectively. Each pixel electrode PE1 is disposed in a region surrounded by 2 scanning lines GL1 and 2 signal lines SL 1. Each of the pixel electrodes PE1 has a plurality of line portions LP1 (first line portions) arranged in the first direction X. The line sections LP1 are arranged at equal intervals in the first direction X. Each line portion LP1 extends in the second direction Y while being bent in directions d1 and d2 intersecting the first direction X. That is, each line portion LP1 extends parallel to the signal line SL1, and the bent shape of the signal line SL1 is the same as the bent shape of the line portion LP1 (the bent shape of the pixel electrode PE 1).

Fig. 5 is a plan view showing in detail the pixels PX2 arranged in the dimming area CA of the dimming panel PNL 2. In addition, in fig. 5, one of the plurality of pixels PX2 arranged in the dimming area CA of the dimming panel PNL2 is shown.

The light control region CA of the light control panel PNL2 corresponds to the display region DA of the liquid crystal display panel PNL1, and overlaps the display region DA in a plan view. In the dimming area CA, a plurality of pixels PX2 are arranged in a matrix. Unlike the liquid crystal display panel PNL1, the light control panel PNL2 does not have to form a color image in order to control brightness, and therefore, as described above, the color filter CF is not disposed on the light control panel PNL 2. That is, the pixel PX2 is different from the pixel PX1 of the liquid crystal display panel PNL1 in that the sub-pixel is not included.

As shown in fig. 5, the scanning lines GL2 (second scanning lines) extend in the first direction X and are arranged at intervals in the second direction Y. The signal lines SL2 (second signal lines) extend in the second direction Y while being bent in directions d3 and d4 intersecting the second direction Y, and are arranged at intervals in the first direction X. The signal line SL2 is bent in a direction opposite to the signal line SL1 of the liquid crystal display panel PNL 1. More specifically, the signal line SL1 of the liquid crystal display panel PNL1 is bent in a shape of a letter \1236767 (L-shape), whereas the signal line SL2 of the light control panel PNL2 is bent in a shape of a letter \12367. In the present embodiment, the angle formed by the second direction Y and the directions d3 and d4 is defined as θ 2. The angle θ 2 is a value larger than the angle θ 1, and the signal line SL2 has a gentle slope compared to the signal line SL1 of the liquid crystal display panel PNL 1. The direction having the angle θ 2 with the second direction Y may be referred to as a second bending direction.

The dummy signal line DSL is disposed between two signal lines SL2 arranged at intervals in the first direction X. Similarly to the signal line SL2, the dummy signal line DSL extends in the second direction Y while being bent in the directions d3 and d 4. In this way, the dummy signal lines DSL are arranged between the two signal lines SL2 arranged at intervals in the first direction X, so that it is possible to suppress a reduction in display quality due to parallax displacement that may occur by overlapping two display panels.

The pixel PX2 has a pixel electrode PE2 (second pixel electrode). As shown in an enlarged view in fig. 5, the pixel electrode PE2 is connected to the switching element SW through the opening OP, and is electrically connected to the scanning line GL2 and the signal line SL 2. Note that, here, a case is assumed where the switching element SW is a bottom gate TFT, but the present invention is not limited thereto, and may be a top gate TFT.

The pixel electrode PE2 has a plurality of line portions LP2 (second line portions) arranged in the first direction X. The line sections LP2 are arranged at equal intervals in the first direction X. Each line portion LP2 extends in the second direction Y while being bent in directions d1 and d2 intersecting the second direction Y. That is, each line part LP2 has the same shape as each line part LP1 constituting the pixel electrode PE1 of the liquid crystal display panel PNL 1. In this way, by making the curved shape of each line part LP1 included in the pixel electrode PE1 the same as the curved shape of each line part LP2 included in the pixel electrode PE2, it is possible to suppress misalignment between the pixel electrode PE1 and the pixel electrode PE2 when the liquid crystal display panel PNL1 and the light control panel PNL2 are overlapped.

As shown in fig. 5, the plurality of line portions LP2 included in the pixel electrode PE2 intersect the signal line SL2 that is electrically connected in a plan view. More specifically, the plurality of line portions LP2 extend in the second direction Y so as to cross (straddle) the electrically connected signal lines SL2 in a plan view. The bent shape of the signal line SL2 and the bent shape of the line portion LP2 (the bent shape of the pixel electrode PE 2) are different in the bending direction and the angle (bent angle) with respect to the second direction Y.

In the present embodiment, it is assumed that the pixels PX2 of the light control panel PNL2 have the same area as the pixels PX1 of the liquid crystal display panel PNL1, and 1 pixel PX2 is arranged for 1 pixel PX1, but the present invention is not limited thereto, and 1 pixel PX2 may be arranged for a plurality of pixels PX 1. For example, 1 pixel PX2 may be arranged for 4 pixels PX 1.

Fig. 6 is a plan view showing a part of two adjacent pixel electrodes PE1 disposed on the liquid crystal display panel PNL1 and a part of two adjacent pixel electrodes PE2 disposed on the light control panel PNL 2.

As described above, the pixel electrode PE1 of the liquid crystal display panel PNL1 is disposed in the region surrounded by the two scanning lines GL1 and the two signal lines SL 1. The signal line SL1 is disposed between two pixel electrodes PE1 adjacent to each other in the first direction X, and a distance D1 shown in fig. 6 (a) is provided between the two pixel electrodes PE 1. By providing the interval of the distance D1 between two adjacent pixel electrodes PE1 in the first direction X, interference of one pixel electrode PE1 with the other pixel electrode PE1 can be suppressed.

On the other hand, as described above, the pixel electrode PE2 of the light control panel PNL2 is not disposed in the region surrounded by the two scanning lines GL2 and the two signal lines SL 2. Therefore, the signal line SL2 does not exist between the 2 pixel electrodes PE2 adjacent to each other in the first direction X, and only the interval of the distance D2 shorter than the distance D1 is provided between the 2 pixel electrodes PE2 as shown in fig. 6 (b). The distance D2 is, for example, a value of 10 μm or less, or a value equal to a distance between two adjacent line sections LP2 in the first direction X.

According to this configuration, one pixel electrode PE2 adjacent to the other pixel electrode PE2 in the first direction X interferes with the other pixel electrode PE2, and even if only the pixel PX2 including the one pixel electrode PE2 is lighted for display, there is a possibility that a part of the pixel PX2 including the other pixel electrode PE2 is lighted for display. However, since the pixels PX2 of the light control panel PNL2 are controlled so that the pixels PX2 located in the periphery thereof are displayed in a lit state in addition to the pixels PX2 corresponding to the display pixels of the liquid crystal display panel PNL1 as a parallax countermeasure, even if a part of the pixels PX2 adjacent to the pixels PX2 to be displayed in a lit state is displayed in a lit state, the display quality of the display device DSP is not affected. In contrast, according to the configuration shown in fig. 6 (b), the line portion LP2 of the pixel electrode PE2 can be uniformly filled with the light control region CA, and the aperture ratio of the light control region CA can be increased as compared with the case where the interval corresponding to the distance D1 of the liquid crystal display panel PNL1 is provided.

Fig. 7 is a plan view showing in detail the light shielding film BM2 disposed on the second transparent substrate SUB22 of the light control panel PNL 2.

As shown in fig. 7, in the dimming panel PNL2, the light shielding film BM2 has a shape different from that of the pixel PX2. Specifically, the light shielding film BM2 has a first portion BM21, a second portion BM22, a third portion BM23, a fourth portion BM24, and a fifth portion BM25.

The first portion BM21 is disposed to overlap the scanning line GL2 and the signal line SL2 in a plan view, extends in the first direction X in the same manner as the scanning line GL2, and extends in the second direction Y while being bent in the directions d3 and d4 in the same manner as the signal line SL 2. The second portion BM22 is arranged to overlap the dummy signal line DSL in a plan view and extend in the second direction Y while being bent in the directions d3 and d4 like the dummy signal line DSL.

The third portion BM23 is arranged to overlap with a switching element SW electrically connected to the scanning line GL2 and the signal line SL2 in a plan view. The fourth portion BM24 is a portion corresponding to the third portion BM23 of the dummy signal line DSL, and is disposed at one end portion of the dummy signal line DSL with the same shape as the third portion BM 23. In this way, although there is no switching element connected to the dummy signal line DSL, by disposing the fourth portion BM24 having the same shape as the third portion BM23, the light shielding film BM2 can be uniformly disposed for the pixels PX2, and therefore, luminance unevenness can be suppressed.

The fifth portion BM25 is arranged to overlap with a spacer for maintaining a gap (interval) between the first transparent substrate SUB12 and the second transparent substrate SUB22 in a plan view.

In fig. 7, the light shielding film BM2 has the shape of the first to fifth portions BM21 to BM25, but the light control panel PNL2 is not easily affected by external light, and therefore the light shielding film BM2 may have a shape in which a part of the first to fifth portions BM21 to BM25 is omitted.

For example, as shown in fig. 8, the light shielding film BM2 may have a shape in which the first portion BM21 and the second portion BM22 are omitted from the shape shown in fig. 7. Alternatively, as shown in fig. 9, the light shielding film BM2 may have a shape in which the first to fourth portions BM21 to BM24 are omitted from the shape shown in fig. 7. According to the shape of the light shielding film BM2 shown in fig. 8 and 9, the aperture ratio of the pixel PX2 can be increased by omitting the light shielding film BM 2.

Hereinafter, the effects of the display device DSP of the present embodiment will be described using comparative examples. Note that the comparative example is intended to explain a part of the effects that can be achieved by the display device DSP of the present embodiment, and the effects common to the comparative example and the present embodiment are not excluded from the scope of the present invention.

Fig. 10 is a plan view showing a pixel PX2' arranged on the light control panel of the comparative example. The pixel PX2' of the comparative example is arranged in a region surrounded by two scanning lines GL2 and two signal lines SL2, and the pixel electrode PE2' included in the pixel PX2' has a shape corresponding to the region surrounded by the two scanning lines GL2 and the two signal lines SL2, which is different from the present embodiment in that.

In general, the curved shape of the plurality of line portions constituting the pixel electrode is optimized, and the plurality of line portions included in the pixel electrode are preferably formed so as to be curved along directions d1 and d2 intersecting the second direction Y at an angle θ 1. Therefore, if the pixel electrode is formed in a shape that matches a region surrounded by 2 signal lines SL2 and 2 scanning lines GL2 that are curved in directions d1 and d2 intersecting the second direction Y at an angle θ 2, which is different from the curved shape of the optimized line portion, the line portion LP2' is broken at the curved end portion of the pixel electrode PE2', or the line portion LP2' has a shape different from the optimized shape, as shown in fig. 10. This causes a problem that an alignment defect occurs at an end of the pixel electrode PE2' when the liquid crystal layer is driven, and the display quality of the display device is degraded.

In contrast, in the present embodiment, the pixel electrode PE2 included in the pixel PX2 is formed as: the line LP2 constituting the entire pixel electrode PE2 is formed in an optimal shape, not in a shape corresponding to the region surrounded by the two scanning lines GL2 and the two signal lines SL2, but in a shape different from the region. Accordingly, as in the comparative example shown in fig. 10, since the line portion LP2 included in the pixel electrode PE2 is not cut off at the bent end portion of the pixel electrode PE2, or the line portion LP2 has a shape different from the optimized shape, alignment failure does not occur at the end portion of the pixel electrode PE2 even when the liquid crystal layer LC2 is driven, and the above-described degradation of the display quality can be suppressed. That is, the display quality of the display device can be improved as compared with the comparative example.

In addition, in the present embodiment, since the shape of the pixel electrode PE2 included in the pixel PX2 can be made the same as the shape of the pixel electrode PE1 of the liquid crystal display panel PNL1, when the liquid crystal display panel PNL1 and the light control panel PNL2 are superimposed, the pixel electrode PE1 and the pixel electrode PE2 are not displaced.

In the present embodiment, the case where the curving direction of the line portion LP2 of the pixel electrode PE2 constituting the light control panel PNL2 is opposite to the curving direction of the signal line SL2 of the light control panel PNL2 is exemplified, but as shown in fig. 11, the curving direction of the line portion LP2 may be the same direction as the curving direction of the signal line SL 2. Even in this case, since the bending angle of the line sections LP2 constituting the pixel electrode PE2 is different from the bending angle of the signal line SL2, all the line sections LP2 have the optimum shape, and the plurality of line sections LP2 extend in the second direction Y so as to cross (straddle) the signal line SL2 in a plan view, the occurrence of the alignment failure described above can be suppressed, and the display quality of the display device can be improved.

According to the above-described embodiment, the display quality of the display device DSP including two display panels, i.e., the liquid crystal display panel PNL1 and the light control panel PNL2, can be improved.

Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims

1. A display device is provided with:

a first display panel having a display area for displaying an image;

a second display panel having a dimming region for controlling brightness of the display region; and

an adhesive layer adhering the first display panel and the second display panel,

the first display panel includes:

a first scan line extending in a first direction; a first signal line which is bent in a first bending direction and extends in a second direction intersecting the first direction; and a first pixel electrically connected to the first scan line and the first signal line, the first pixel including a first pixel electrode having a plurality of first line portions extending in parallel with the first signal line,

the second display panel includes:

a second scanning line extending in the first direction; a second signal line which is bent in a second bending direction and extends in the second direction; and a second pixel electrically connected to the second scanning line and the second signal line, the second pixel including a second pixel electrode having a plurality of second line portions intersecting the second signal line in a plan view.

2. The display device according to claim 1,

the plurality of second line portions extend in the second direction while being bent in the first bending direction, and cross the second signal line in a plan view.

3. The display device according to claim 1,

the bent shape of the first signal line is different from the bent shape of the second signal line,

the second signal line is bent to a side opposite to the first signal line.

4. The display device according to claim 3,

a bending angle of the first signal line made by the second direction and the first bending direction is smaller than a bending angle of the second signal line made by the second direction and the second bending direction.

5. The display device according to claim 1,

the curved shape of the plurality of first wire portions is the same as the curved shape of the plurality of second wire portions.

6. The display device according to claim 5,

the bent shape of the first signal line is the same as the bent shape of the plurality of first line parts,

the bent shape of the second signal line is different from the bent shape of the plurality of second line parts.

7. The display device according to claim 1,

the plurality of second line portions are arranged at equal intervals in the first direction.

8. The display device according to claim 7,

an interval equal to a distance between 2 second line portions adjacent to each other in the first direction X is provided between the second pixel electrode and another second pixel electrode arranged adjacent to the second pixel electrode in the first direction X.

9. The display device according to claim 8,

an interval of 10 μm or less is provided between the second pixel electrode and the other second pixel electrode.

10. The display device according to claim 1,

the second display panel further includes:

a first substrate; a second substrate opposed to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate; a spacer for maintaining a space between the first substrate and the second substrate; and a light-shielding film,

the light shielding film is disposed at a position overlapping the spacer in a plan view.

11. The display device according to claim 10,

the light shielding film is also disposed at a position overlapping with a switching element for electrically connecting the second scanning line and the second signal line in a plan view.

12. The display device according to claim 11,

the light shielding film is also disposed at a position overlapping the second scanning line and the second signal line in a plan view.